118 lines
3.6 KiB
HTML
118 lines
3.6 KiB
HTML
<html>
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<!--
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Copyright (c) 2003 Vladimir Prus
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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-->
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<head>
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<title>Boost Graph Library: random</title>
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<body BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
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ALINK="#ff0000">
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<IMG SRC="../../../boost.png"
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ALT="C++ Boost" width="277" height="86">
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<br>
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The header <tt><boost/graph/random></tt> provides routines to create
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random graph, select random vertices and edges, and randomize properties.
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<h1>Synopsis</h1>
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<pre>
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template <class Graph, class RandomNumGen>
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typename graph_traits<Graph>::vertex_descriptor
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random_vertex(Graph& g, RandomNumGen& gen);
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template <class Graph, class RandomNumGen>
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typename graph_traits<Graph>::edge_descriptor
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random_edge(Graph& g, RandomNumGen& gen);
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template <typename MutableGraph, class RandNumGen>
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void generate_random_graph
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(MutableGraph& g,
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typename graph_traits<MutableGraph>::vertices_size_type V,
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typename graph_traits<MutableGraph>::vertices_size_type E,
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RandNumGen& gen,
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bool self_edges = false);
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template<class Property, class G, class RandomGenerator>
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void randomize_property(G& g, RandomGenerator rg);
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</pre>
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<h1>Description</h1>
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<h2 id="random_vertex">random_vertex</h2>
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<pre>
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template <class Graph, class RandomNumGen>
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typename graph_traits<Graph>::vertex_descriptor
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random_vertex(Graph& g, RandomNumGen& gen);
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</pre>
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<p><b>Effects:</b> Selects a random vertex in a graph and returns it.
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<p><b>Preconditions:</b> <tt>num_vertices(g) != 0</tt>
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<p><b>Complexity:</b> <tt>O(num_vertices(g))</tt>
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<h2 id="random_edge">random_edge</h2>
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<pre>
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template <class Graph, class RandomNumGen>
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typename graph_traits<Graph>::edge_descriptor
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random_edge(Graph& g, RandomNumGen& gen);
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</pre>
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<p><b>Effects:</b> Selects a random edge in a graph and returns it.
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<p><b>Preconditions:</b> <tt>num_edges(g) != 0</tt>
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<p><b>Complexity:</b> <tt>O(num_edges(g))</tt>
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<h2 id="generate_random_graph">generate_random_graph</h2>
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<pre>
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template <typename MutableGraph, class RandNumGen>
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void generate_random_graph
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(MutableGraph& g,
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typename graph_traits<MutableGraph>::vertices_size_type V,
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typename graph_traits<MutableGraph>::vertices_size_type E,
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RandNumGen& gen,
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bool allow_parallel = true,
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bool self_edges = false);
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</pre>
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<p><b>Effects:</b> Adds <tt>V</tt> vertices and <tt>E</tt> edges, to
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<tt>g</tt>. Source and target vertices of each edge are randomly choosen. If
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<tt>self_edges</tt> is false, then no edge will have the same source and
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targets.
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<p><b>Precondition:</b> <tt>num_vertices(g) == 0</tt>
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<p><b>Compleixity:</b> <tt>O(V*E)</tt>
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<h2 id="randomize_property">randomize_property</h2>
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<pre>
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template<class Property, class G, class RandomGenerator>
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void randomize_property(G& g, RandomGenerator& rg);
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</pre>
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<p><b>Effects:</b> Sets the random value of property on either all vertices, or
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all edges, depending on property kind.
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<p><b>Complexity:</b> <tt>O(V)</tt> or <tt>O(E)</tt>, depending on property
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kind.
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<hr>
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<p class="revision">Last modified: Feb 05, 2003</p>
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<p>© Copyright Vladimir Prus 2003. Permission to copy, use, modify,
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sell and distribute this document is granted provided this copyright
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notice appears in all copies. This document is provided ``as is'' without
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express or implied warranty, and with no claim as to its suitability for
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any purpose.</p>
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</body>
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</html>
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